{"product_id":"walter-6890844-turning-insert-cnmg120408-ms3-wsm20s-carbide","title":"Walter 6890844 Turning Insert CNMG120408-MS3 WSM20S Carbide","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe WALTER 6890844 is a solid carbide turning insert in the CNMG120408-MS3 WSM20S configuration, designed for high-performance metal removal in demanding CNC turning operations. It carries a multilayer PVD coating of TiCN, Al2O3, and Al, delivering heat and wear resistance suited to difficult-to-machine materials. The insert features an 80-degree diamond shape, a negative rake angle of 13 degrees, a honed cutting edge, and a 0.8 mm corner radius. With four usable cutting edges per insert and the MS3 chip breaker geometry, it targets efficient chip control across turning, facing, and boring applications. Licensed machinists and CNC operators in precision manufacturing environments are the primary users.\u003c\/p\u003e\n\u003cp\u003eThis insert is engineered primarily for stainless steel and superalloys and titanium (ISO material codes M and S), with secondary suitability for steel (ISO code P). It fits the CNMG-MS3 series and meets both ANSI and ISO standards, making it compatible with standard CNMG toolholders using clamp or pin holding methods. The insert is rated for a maximum depth of cut of 12.90 mm (0.5080 inches) and is suited to both roughing and semi-finishing passes on CNC lathes and turning centers in production and job-shop environments.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003ePVD-applied TiCN, Al2O3, and Al multilayer coating for extended tool life in stainless steel and titanium\u003c\/li\u003e\n  \u003cli\u003eMS3 chip breaker geometry for controlled chip evacuation in continuous and interrupted cuts\u003c\/li\u003e\n  \u003cli\u003e80-degree diamond insert shape with negative rake for strong cutting edge and reduced chipping risk\u003c\/li\u003e\n  \u003cli\u003eFour cutting edges per insert for cost-efficient indexing\u003c\/li\u003e\n  \u003cli\u003eHoned cutting edge style reduces micro-chipping on tough alloys\u003c\/li\u003e\n  \u003cli\u003eSuitable for turning, facing, and boring on CNC lathes and turning centers\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for use in standard CNMG toolholders that accept clamp or pin insert holding methods. Conforms to ANSI and ISO CNMG insert standards (ISO code CNMG120408-MS3, industry standard number CNMG432-MS3). Verify toolholder clearance and insert seat dimensions before installation.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is performed by CNC machinists or tooling technicians. Power down and lock out the machine before indexing or replacing inserts. Seat the insert fully and evenly in the toolholder pocket before tightening the clamp or pin to manufacturer torque specifications. Inspect the insert seat and clamp for debris or wear that could affect seating and cutting edge runout.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eISO Code\u003c\/strong\u003e: CNMG120408-MS3 WSM20S\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIndustry Standard Number\u003c\/strong\u003e: CNMG432-MS3 WSM20S\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsert Shape\u003c\/strong\u003e: Diamond 80 degrees\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsert Material\u003c\/strong\u003e: Solid Carbide\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Grade\u003c\/strong\u003e: WSM20S\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoating\u003c\/strong\u003e: TiCN, Al2O3, Al (PVD process)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eChip Breaker\u003c\/strong\u003e: MS3\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCorner Radius\u003c\/strong\u003e: 0.8 mm (1\/32 inch, 0.0315 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInscribed Circle\u003c\/strong\u003e: 12.70 mm (0.5000 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsert Length\u003c\/strong\u003e: 12.90 mm (0.5080 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsert Thickness\u003c\/strong\u003e: 4.76 mm (0.1875 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaximum Depth of Cut\u003c\/strong\u003e: 12.90 mm (0.5080 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHole Diameter\u003c\/strong\u003e: 5.16 mm (0.2030 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNumber of Cutting Edges\u003c\/strong\u003e: 4\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRake Angle\u003c\/strong\u003e: 13 degrees (Negative)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRelief Angle\u003c\/strong\u003e: 0 degrees\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eClearance Code\u003c\/strong\u003e: N\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTolerance Code\u003c\/strong\u003e: M\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsert Hand\u003c\/strong\u003e: Neutral\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCutting Edge Style\u003c\/strong\u003e: Honed\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsert Holding Method\u003c\/strong\u003e: Clamp, Pin\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePrimary Workpiece Material\u003c\/strong\u003e: Stainless Steel, Superalloys and Titanium (ISO M, S)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSecondary Workpiece Material\u003c\/strong\u003e: Steel (ISO P)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial Grade\u003c\/strong\u003e: M20, S20, P20\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApplications\u003c\/strong\u003e: Turning, Facing, Boring\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStandards\u003c\/strong\u003e: ANSI, ISO\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.02 pounds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUNSPSC Code\u003c\/strong\u003e: 23242105\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eStandard Information\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: WALTER\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 6890844\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"WALTER","offers":[{"title":"Default Title","offer_id":51959746822450,"sku":"6890844","price":38.24,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/0ae38432f9a4cd34c3cb5962c452b2f2.jpg?v=1789945871","url":"https:\/\/voomisupply.com\/products\/walter-6890844-turning-insert-cnmg120408-ms3-wsm20s-carbide","provider":"Voomi Supply","version":"1.0","type":"link"}